39645446357 has 18 divisors (see below), whose sum is σ = 45554338326. Its totient is φ = 34474245520.

The previous prime is 39645446333. The next prime is 39645446359. The reversal of 39645446357 is 75364454693.

It can be written as a sum of positive squares in only one way, i.e., 39645190321 + 256036 = 199111^2 + 506^2 .

It is not a de Polignac number, because 39645446357 - 2¹⁶ = 39645380821 is a prime.

It is a super-2 number, since 2×39645446357² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39645446359) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 245678 + ... + 373695.

Almost surely, 2^39645446357 is an apocalyptic number.

It is an amenable number.

39645446357 is a deficient number, since it is larger than the sum of its proper divisors (5908891969).

39645446357 is a wasteful number, since it uses less digits than its factorization.

39645446357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619441 (or 619407 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 56.

The spelling of 39645446357 in words is "thirty-nine billion, six hundred forty-five million, four hundred forty-six thousand, three hundred fifty-seven".